1.1 本实践限于操作荧光UV灯和水设备的基本原理；就其本身而言，它并不能带来具体的结果。 1.2 它旨在与定义应用特定暴露条件的实践或方法以及评估材料特性变化的方法结合使用。本规程旨在重现材料在实际使用中暴露于阳光（直接或通过窗户玻璃）和雨水或露水等湿气时产生的风化效应。本规程仅限于获取、测量和控制暴露条件的程序。 注1: 实践 第151页 描述了在使用实验室光源的加速测试设备中暴露非金属材料时使用的一般程序。 注2: 附录中列出了一些暴露程序；然而，本规程并未规定最适合待测材料的暴露条件。 1.3 在受控的环境条件下，将试样暴露于荧光紫外光。描述了不同类型的荧光UV灯源。 注3: 在本标准中，术语 紫外线灯 和 紫外线辐射 可以互换使用。 1.4 ASTM方法或特定材料规范涵盖了试样制备和结果评估。实践中提供了一般指导 第151页 和ISO 4892-1. 注4: ISO中描述了确定暴露后特性变化和报告这些结果的方法的一般信息 4582和实践 D5870型 . 1.5 本规程不适用于裸露金属的腐蚀试验。 1.6 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.7 本标准在技术上与ISO相似 4892-3和ISO 16474-3。 1.8 本标准并不旨在解决与其使用相关的所有安全问题（如有）。 本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.9 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 该设备的使用旨在引起与最终使用条件一致的性能变化，包括阳光、水分和热量的UV部分的影响。通常，这些暴露将包括冷凝湿度形式的水分。暴露不是为了模拟局部天气现象造成的恶化，如大气污染、生物攻击和盐水暴露。 或者，曝光可以模拟阳光透过窗户玻璃的效果。( 警告- 参考实践 第151页 适用于所有实验室风化装置的完整警示指南。） 5.2 本规程提供了操作荧光紫外灯风化装置的一般程序，该装置允许广泛的暴露条件。因此，除非附有详细说明具体操作条件的报告，否则不得参考本规程的使用结果 10 . 5.2.1 建议将具有已知性能的类似材料（对照）与试样同时暴露，以提供用于比较的标准。通常，建议使用两种控制:一种已知耐久性差，另一种已知持久性好。建议在每次试验中暴露至少三个被评估材料的重复，以便对结果进行统计评估。 5.2.2 除非在待测材料的装置之间建立了再现性，否则不得对暴露在同一型号仪器中的试样的结果进行比较。 5.2.3 除非在待测材料的装置之间建立了相关性，否则不得对暴露在不同型号设备中的试样的结果进行比较（见指南 D6631型 用于指导）。

1.1 This practice is limited to the basic principles for operating a fluorescent UV lamp and water apparatus; on its own, it does not deliver a specific result. 1.2 It is intended to be used in conjunction with a practice or method that defines specific exposure conditions for an application along with a means to evaluate changes in material properties. This practice is intended to reproduce the weathering effects that occur when materials are exposed to sunlight (either direct or through window glass) and moisture as rain or dew in actual usage. This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure. Note 1: Practice G151 describes general procedures to be used when exposing nonmetallic materials in accelerated test devices that use laboratory light sources. Note 2: A number of exposure procedures are listed in an appendix; however, this practice does not specify the exposure conditions best suited for the material to be tested. 1.3 Test specimens are exposed to fluorescent UV light under controlled environmental conditions. Different types of fluorescent UV lamp sources are described. Note 3: In this standard, the terms UV light and UV radiation are used interchangeably. 1.4 Specimen preparation and evaluation of the results are covered in ASTM methods or specifications for specific materials. General guidance is given in Practice G151 and ISO 4892-1. Note 4: General information about methods for determining the change in properties after exposure and reporting these results is described in ISO 4582 and Practice D5870 . 1.5 This practice is not intended for corrosion testing of bare metals. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 This standard is technically similar to ISO 4892-3 and ISO 16474-3. 1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The use of this apparatus is intended to induce property changes consistent with the end use conditions, including the effects of the UV portion of sunlight, moisture, and heat. Typically, these exposures would include moisture in the form of condensing humidity. Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure. Alternatively, the exposure may simulate the effects of sunlight through window glass. ( Warning— Refer to Practice G151 for full cautionary guidance applicable to all laboratory weathering devices.) 5.2 This practice provides general procedures for operating fluorescent UV lamp weathering devices that allow for a wide range of exposure conditions. Therefore, no reference shall be made to results from the use of this practice unless accompanied by a report detailing the specific operating conditions in conformance with Section 10 . 5.2.1 It is recommended that a similar material of known performance (a control) be exposed simultaneously with the test specimen to provide a standard for comparative purposes. Generally, two controls are recommended: one known to have poor durability and one known to have good durability. It is recommended that at least three replicates of each material evaluated be exposed in each test to allow for statistical evaluation of results. 5.2.2 Comparison of results obtained from specimens exposed in the same model of apparatus should not be made unless reproducibility has been established among devices for the material to be tested. 5.2.3 Comparison of results obtained from specimens exposed in different models of apparatus should not be made unless correlation has been established among devices for the material to be tested (see Guide D6631 for guidance).